book Maths Puzzle Numerical Ability

can someone please help me understand when an elimination method for solving a system of equations would be preferable over the substitution method?

Thank you

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book Other Question

Find the slope of the line...


3x - 6y = 18
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Find sets of values for a,b,and c such that 0 is less than or equal to x which is less than or equal to 12 (Sorry but I didn't know how to draw it out) is